Stirrer mill

Patent metadata

Field	Value
Publication number	US-12138632-B2
Application number	US-202017754235-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Oct 1, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A stirrer mill for processing flowable material to be ground including a mill container, a milling chamber that is delimited by a container wall, a stirrer that can rotate about the center longitudinal axis and has a rotor, and an inner stator arranged within the rotor. A ground material discharge channel is formed between the rotor and an outer wall of the inner stator, via which the ground material is guided to the separation unit and then to an outlet line. The milling chamber is at least partially filled with milling elements. A separation unit is arranged above the inner stator. A ground material discharge chamber is formed after the milling element separation unit, in the flow direction of the ground material. A unit for reducing the volume is attached in the ground material discharge chamber.

First claim

The invention claimed is:

1. A stirrer mill for processing flowable material to be ground, comprising:
a mill container and a milling chamber that is delimited by a container wall of the mill container and is at least partially filled with milling elements, and
a stirrer with a rotor that can rotate during operation about a center and vertically oriented longitudinal axis, and
an inner stator which is arranged within the rotor, and
wherein a ground material discharge channel is formed between the rotor and an outer wall of the inner stator, via which the ground material is guided through a milling element separation unit in the direction of a discharge pipe, wherein a ground material discharge chamber is formed after the milling element separation unit in the flow direction of the ground material,
wherein a unit for reducing the volume of the ground material discharge chamber is arranged in the ground material discharge chamber,
wherein the unit for reducing the volume terminates product-tight with a discharge floor of the stirrer mill and has an overflow height h of the product in the vertical direction, wherein a height H of the milling element separation unit is greater than the overflow height h,
wherein h is greater than or equal to 0.85 H.

2. The stirrer mill according to claim 1 , wherein the milling element separation unit comprises a vertically oriented cylinder having the height H, the interior of which forms the ground material discharge chamber, and the unit for reducing the volume of the ground material discharge chamber comprises a filling body.

3. The stirrer mill according to claim 1 , wherein the unit for reducing the volume of the ground material discharge chamber comprises a cylindrical hollow body.

4. The stirrer mill according to claim 1 , wherein the unit for reducing the volume of the ground material discharge chamber comprises one or more of plastic or metal or ceramic material.

5. The stirrer mill according to claim 1 , further comprising a temperature control system.

6. The stirrer mill according to claim 1 , wherein the separation unit comprises a cylindrical screen.

7. The stirrer mill according to claim 1 , wherein the unit for reducing the volume of the ground material discharge chamber is removable.

8. The stirrer mill according to claim 1 , wherein the unit for reducing the volume of the ground material discharge chamber reduces the volume of the ground material discharge chamber by at least 70%.

9. The stirrer mill according to claim 1 , wherein tools that protrude into the milling chamber are attached to one or more of the rotor and the container wall.

10. A method for operating and cleaning a stirrer mill, comprising inserting the unit for reducing the volume of the ground material discharge chamber of the stirrer mill according to claim 1 ,
wherein the flow rate is increased and air inclusions are avoided via the insertion of the unit for reducing the volume.

Assignees

• Buehler Ag

Inventors

• Nater Eduard
• Sturm Achim
• Rieche Andreas

Classifications

• B02C17/1855

  with separator defining termination of crushing zone, e.g. screen denying egress of oversize material · CPC title

• B02C17/183

  Feeding or discharging devices · CPC title

• B02C17/161 Primary

  Arrangements for separating milling media and ground material · CPC title

• B02C17/16 Primary

  Mills in which a fixed container houses stirring means tumbling the charge · CPC title